<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>svg画任意两点间的箭头-第二版</title>
</head>
<body>
    <svg id="root-svg" width="800" height="800" style="border: 1px solid #000;"></svg>
    <script src="./js/index-second.js"></script>
</body>
</html>